HarmonyOS tabs不能设置左对齐

设置tabs左对齐可以参考以下demo：

@Entry
@Component
struct Index {
  @State message: string = 'HelloWorld';
  private tabsController: TabsController = new TabsController()
  @State currentIndex: number = 0;

  @Builder
  TabBarBuilder(title: string, targetIndex: number) {
    Text(title).fontWeight(targetIndex === this.currentIndex ? FontWeight.Bold : FontWeight.Normal).margin({ left: 10, right: 10 })
      .onClick(() => {
        this.tabsController.changeIndex(targetIndex)
      })
  }

  build() {
    Row() {
      Column() {
        Flex({ direction: FlexDirection.Row }) {
          this.TabBarBuilder('页签1', 0)
          this.TabBarBuilder('页签2', 1)
          this.TabBarBuilder('页签3', 2)
        }

        Tabs({ barPosition: BarPosition.End, controller: this.tabsController }) {
          TabContent() {
            Text("页签1页面")
          }

          TabContent() {
            Text("页签2页面")
          }

          TabContent() {
            Text("页签3页面")
          }
        }.onChange((index: number) => {
          this.currentIndex = index;
        })
      }
    }
  }
}
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